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C 30 1 Ton Pickup 2WD V8-454 7.4L VIN W 4-bbl (1983)

Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Electronic Spark Control Module > Component Information > Locations > Page 30

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Electronic Spark Control Module: Testing and Inspection

    Use the following procedures to diagnose ESC system malfunctions only. To diagnose general ignition system malfunctions, refer to ``High Energy
Ignition (HEI) System Diagnosis.''

Fig. 4 ESC system wiring schematic. 1983

1983 MODELS

Engine Cranks But Will Not Start

1.

Inspect ESC harness for damage, shorts and opens. Inspect controller connector, distributor connectors and ignition switch connectors for
corrosion, damage and deformed terminals, Fig. 4. Repair connectors and wiring as needed.

2.

Disconnect distributor 4 pin connector, connect pins A and C on distributor side of connector with jumper wire, then attempt to start engine. If

Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Electronic Spark Control Module > Component Information > Locations > Page 30

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